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PLoS One. 2014 Aug 12;9(8):e103059. doi: 10.1371/journal.pone.0103059. eCollection 2014.

Macrophage phenotype is associated with disease severity in preterm infants with chronic lung disease.

Author information

1
Academic Unit of Respiratory Medicine, Department of Infection and Immunity, University of Sheffield, Sheffield Teaching Hospitals NHS Trust, Sheffield, United Kingdom.
2
Department of Child Health, Cardiff University, Cardiff, United Kingdom.
3
Academic Unit of Immunology and Infectious Disease, Department of Infection and Immunity, University of Sheffield, Sheffield Teaching Hospitals NHS Trust, Sheffield, United Kingdom.

Abstract

BACKGROUND:

The etiology of persistent lung inflammation in preterm infants with chronic lung disease of prematurity (CLD) is poorly characterized, hampering efforts to stratify prognosis and treatment. Airway macrophages are important innate immune cells with roles in both the induction and resolution of tissue inflammation.

OBJECTIVES:

To investigate airway innate immune cellular phenotypes in preterm infants with respiratory distress syndrome (RDS) or CLD.

METHODS:

Bronchoalveolar lavage (BAL) fluid was obtained from term and preterm infants requiring mechanical ventilation. BAL cells were phenotyped by flow cytometry.

RESULTS:

Preterm birth was associated with an increase in the proportion of non-classical CD14(+)/CD16(+) monocytes on the day of delivery (58.9 ± 5.8% of total mononuclear cells in preterm vs 33.0 ± 6.1% in term infants, p = 0.02). Infants with RDS were born with significantly more CD36(+) macrophages compared with the CLD group (70.3 ± 5.3% in RDS vs 37.6 ± 8.9% in control, p = 0.02). At day 3, infants born at a low gestational age are more likely to have greater numbers of CD14(+) mononuclear phagocytes in the airway (p = 0.03), but fewer of these cells are functionally polarized as assessed by HLA-DR (p = 0.05) or CD36 (p = 0.05) positivity, suggesting increased recruitment of monocytes or a failure to mature these cells in the lung.

CONCLUSIONS:

These findings suggest that macrophage polarization may be affected by gestational maturity, that more immature macrophage phenotypes may be associated with the progression of RDS to CLD and that phenotyping mononuclear cells in BAL could predict disease outcome.

PMID:
25115925
PMCID:
PMC4130498
DOI:
10.1371/journal.pone.0103059
[Indexed for MEDLINE]
Free PMC Article

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